How to open pdf from ajax response

I am trying to open a PDF document received as a response text, in a new browser tab.

My controller code is :

$objWriter = \PhpOffice\PhpWord\IOFactory::createWriter($phpWord,'HTML');
$objWriter->save('helloWorld.html');
$pdf = App::make('dompdf.wrapper');
$pdf->loadHTML('helloWorld.html');
$data = $pdf->stream();
return $data;

And the ajax code so far (not working) :

$('body').on('click', '.printInvoice', function () {
    var purchase_id = $(this).data("id");
        $.ajax({
            type: "GET",
            url: "/purchases/print" + '/' + purchase_id,
            success: function (data) {
                console.log(data);
                var blob = data;
                var link = document.createElement('a');
                link.href = window.URL.createObjectURL(blob);
                link.download = "PdfName-" + new Date().getTime() + ".pdf";
                document.body.appendChild(link);
                link.click();
            },
            error: function (data) {
                var data2 = JSON.parse(data.responseText);
                alert(data2['errors']);
            }
        });
});

The code above is generating following error : 'createObjectURL' on 'URL': No function was found that matched the signature provided.

Please help to fix above code, or give a better solution to the problem.

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